11.   To the observer, however, it appeared to be a group of costumes for laboratory workers in an old sci-fi film.

12.   Two laboratory workers said that Williams changed their dictated reports, in violation of FBI policy.

13.   Two of the three cases have involved laboratory workers who accidentally became infected with the virus while working with it.

14.   Until the Gulf War, it was used primarily by laboratory workers and veterinarians who might be exposed to the rare disease.

15.   Villagers fear sleeping sickness so much that some laboratory workers say they are testing for malaria, which is known to be treatable.

16.   Vaccination is limited chiefly to laboratory workers directly involved with the virus or its close virological cousins.

17.   A laboratory worker was killed in the explosion, police said.

18.   A laboratory worker also was infected by the virus and developed antibodies to fight it.

19.   The CDC said earlier this month that a Texas laboratory worker handling anthrax specimens became infected with the bacteria and is recovering.

20.   The next few weeks -- and possibly months -- of the trial promise a parade of police technicians, laboratory workers and expert scientists.